(19)
(11) EP 0 263 567 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
25.04.1990 Bulletin 1990/17

(43) Date of publication A2:
13.04.1988 Bulletin 1988/15

(21) Application number: 87201913.8

(22) Date of filing: 07.10.1987
(51) International Patent Classification (IPC)4G01N 30/32
(84) Designated Contracting States:
CH DE FR GB IT LI NL SE

(30) Priority: 10.10.1986 GB 8624325

(71) Applicants:
  • PHILIPS ELECTRONICS UK LIMITED
    Croydon CR9 3QR (GB)

    GB 
  • Philips Electronics N.V.
    5621 BA Eindhoven (NL)

    CH DE FR IT LI NL SE 

(72) Inventor:
  • James, Phillip Andrew
    Cambridge CB1 2PX (GB)

(74) Representative: Andrews, Arthur Stanley et al
Philips Electronics UK Limited Patents and Trade Marks Department Cross Oak Lane
Redhill, Surrey RH1 5HA
Redhill, Surrey RH1 5HA (GB)


(56) References cited: : 
   
       


    (54) Liquid chromatograph apparatus


    (57) Liquid chromatograph apparatus comprises a plurality of solvent sources (104,105) feeding a pump (102) via a proportioning valve arrangement (100). The proportioning valve arrangement (100) has a plurality of inlets (108,109) and a single outlet (110) which is coupled to the inlet coupling (112) of the pump (102). The inlet coupling (112) is mounted directly on the pump head (103) and incorporates a filter (118, Figure 3). The pump outlet (137) is fed via a tube (138) to a chromatographic separating column.
    The solvent sources (104,105) are coupled to the proportioning valve inlets (108,109) via tubes (106,107) without the provision of separate filters. This gives more equal average flow rates and enables more accurate proportioning of the solvent mixture to be obtained.







    Search report